This is a pike livebearer! The gals get about as long and tall as a banana, the boys stay the size of the one in that person’s hand, and their fry are born alive (no eggs) and about the size of guppies. This is the largest livebearer fish we know of, and they will strongly attempt to swallow anything that’s not at least their size.
Looks like, in the absence of things to move towards or away from, they’ve defaulted to the basic schooling fish “follow the nearest leader” instinct. Too bad we can’t also see it from underwater.
BettSplendens Tumblr Evac 